Perhaps you should try some spelling variations:
truong thanh » truong trung, truong thpt, truong chung
chieu sang » chieu sach, chieu xanh, hieu lang
trung tuan » trung tam, tran tuan
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, ho chieu
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sang - hanh ((((trung tuan) OR (truong thanh))) or (trung thanh)) thong cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - hanh ((((trung tuan) OR (truong thanh))) OR (trung thanh)) thong cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - hanh ((((trung tuan) OR (truong thanh))) or (trung thanh)) thong cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - hanh ((((trung tuan) OR (truong thanh))) or (trung thanh)) thong cong tac toan cau*.